XV, 4 



Oshima: Formosan Termites 



359 



of these two are not high, it is probable that the main part of 

 the oil consists of a group of sesquiterpene alcohols. 



Fractionation of the neutral oil — Two hundred grams of 50 

 per cent aqueous solution of sodium hydroxide are added to 

 100 grams of the crude oil, and the mixture is shaken for two 

 hours. Then ether is added in order to separate the oil from 

 the solution. Eliminating the ether, the neutral oil is obtained 

 free from acid and phenol. About 80 per cent of the crude 

 oil is neutral oil having the following properties: 



Table XVII. — Properties of the neutral oil from cypress pine. 



Specific gravity (at 10°C.) 1.009 



Refractive index (at 19°C.) 1.5090 



Optical rotatory power ([ a ] D in 20 per cent ethyl 



alcohol) (degrees) -fl9.5 



Ester value 33.75 



Ester value after acetylation 162.5 



These ester values indicate the presence of about 56 per cent 

 of alcohol (C 15 H 2fi O) in the neutral oil. 



This oil evaporates at 120° C. under reduced pressure (4 

 millimeters), thus indicating more clearly the presence of ses- 

 quiterpene alcohol. 



The result of a fractional distillation of a 50-gram sample 

 of the neutral oil is shown in Table XVIII. 



Table XVIII. — Fractions obtained from the neutral oil of cypress pine. 



Distilling point; pressure, 4 mm. 



1 

 Yield. 



115 to 119 



°C. 



Grams. 

 11 

 23 

 2 

 7 

 6 



Per cent. 

 18.0 

 37.7 



3.3 

 11.5 



9.8 



119 to 125 



125 to 135 



135 to 145 



145 to 170 , , 





The fractional distillation is repeated three times ; and, finally, 

 the results recorded in Table XIX are obtained. 



Table XIX. — Final fractions from the neutral oil of cypress pine. 



Distilling point; pressure, 3. 5 mm. 



Yield. 



Refrac- 

 tive 

 index. 



R. tation 

 [a]D 



110 to 115 „ 



°C. 



Grams. 

 1 

 16 

 11 

 9 

 6 



L6045 

 1.5066 

 1.5082 

 1. 6095 

 1. 6128 



Degrees. 

 + 10 

 +10.5 

 +21.1 



+ 24.6 

 +36.4 



115 to 122 



122 to 128 



128 to 142 



142 to 165 





